JPS5918783B2 - tape cassette - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tape cassette used in a magnetic recording/reproducing device, and provides a tape cassette with a simple structure in which an opening/closing lid covering a recording/reproducing opening of a tape cassette body can be opened and closed in both directions. It is something to do.

In tape cassettes used in magnetic recording and reproducing devices,
Exposing the magnetic tape when not in use not only causes dust to adhere to the magnetic tape and cause dropouts, but also causes problems such as fingers touching the magnetic tape surface or the magnetic tape being pulled out. arise. Therefore, conventionally,
When not in use, the magnetic tape surface is covered and protected with an opening/closing lid, and when attached to a magnetic recording/reproducing device, the first
As shown in FIG. 1, in most cases, a lid 4 of a tape cassette 3 is opened using a lid opening claw 2 of the device 1, so that the magnetic tape inside the device 1 is exposed.

However, as explained below, there are cases where the tape cassette is used inverted for reasons such as recording audio signals.
In this case, as shown in FIG. 1, in the tape cassette 3 having the above structure, the opening/closing lid 4 cannot be opened by the claw 2.

In the conventional helical scan recording method, as shown in FIG. 2A, the video track signal V1 is recorded with a video track length S with an inclination of an angle θ1.

Furthermore, the audio signal Al is recorded on the upper end of the magnetic tape. The audio signal Al has a property that the faster the tape speed, the better the sound can be obtained. In the case of FIG. 2A, by increasing the slope .theta. of the video track signal V, shortening the video track length S, and narrowing the track pitch P, high density recording can be achieved on the magnetic tape.

However, since the tape speed is slow, the audio characteristics deteriorate and good sound cannot be expected. Therefore, as shown in Figure 2, a magnetic tape is used in which recording is performed by dividing the tape into two in the width direction, and the tape cassette is inverted.

In this case, when the track pitch P and video track length S of video track signals 1 and 2 are the same, the slope θ2 of the video track signal V1 is smaller than the slope θ of the video track signal V1. Therefore, the tape speed becomes faster than before, and naturally the scanning speed of the audio signal A also becomes faster. Therefore, there are the following advantages. (1) Audio signal A
(2) The inclination of the video track 2 becomes smaller, so the inclination of the head cylinder H also becomes smaller, which makes the magnetic recording and reproducing device thinner. I can figure it out.

(3) For example, when recording on a 1/4 inch wide tape, compared to recording across the entire width of the tape, when recording is divided into upper and lower parts with double the width of 1/2 inch, the tape speed is the same, but the 1/4 inch Compared to tape, tape stretches less and skew is reduced.

In addition, since an air film is easily formed, tape running properties are improved and high-quality images can be obtained. In order to obtain various effects as described above, it is required that the tape cassette can be used by inverting it, and in this case, it is necessary to be able to open and close the opening/closing lid both upward and downward.

The present invention has been made in view of the above circumstances, and embodiments thereof will be described below based on the drawings. In FIG. 3, the tape cassette main body 11 accommodates a pair of reels 13 in parallel with a tape cassette main body lid 12.

The tape cassette body lid 12 is the tape cassette body 11.
The planar shape of the inner surface is approximately the same as that of the tape cassette body 11, except for a position regulating body 14 protruding from the center of the front surface of the tape cassette body 11. The tape cassette body lid 12 is fixed to the tape cassette body 11 by screws 15. Holes 16 provided in the tape cassette body 11 and the tape cassette body lid 12 are for engaging the reel 13 with a reel stand of a recording/reproducing apparatus. In addition, reel 13
is vertically symmetrical. The magnetic tape 17 is wound around a reel 13 and is stretched between a pair of tape posts 18, 18, which are guided by the tape posts 18 at both ends of the front of the tape cassette body 11 and the tape post slot 9 in the vicinity. 17, the tape position is regulated by a position regulating body 14 of the tape cassette body 11.

The opening/closing lid 20 that covers the recording/playback opening of the tape cassette main body 11 has a tongue piece 20a at the center of the upper and lower edges to prevent fingers from being inserted.
The support portions 21, which have support portions 21 protruding near both ends in the longitudinal direction, are in contact with the outer surfaces of the support walls 22 on both sides of the front portion of the tape cassette main body 11.

Further, the left and right support parts 21 are arranged at different levels from each other, that is, one support part 21 is arranged at the upper part of the opening/closing lid 20, and the other supporting part 21 is arranged at the lower part of the opening/closing lid 20. Therefore, even if the opening/closing lid 20 is turned upside down, the support portion 21 will always remain in the same position. A lid stay 23 is arranged on the outside of the support part 21, and the lid stay pin 26 that passes through the mounting hole 24 of the lid stay 23 and the mounting hole 25 of the opening/closing lid 20 allows the opening/closing lid 20 and the lid stay 23 to rotate relative to each other. freely supported. The lid stay pin 26 is prevented from coming off by caulking or the like.The lid stay pin 26 serves as a first fulcrum. The other mounting hole 27 of the lid stay 23 is screwed into the screw hole 30 of the support wall 22 of the tape cassette body 11 with a screw 28 via a collar 29, and the lid stay 23 is rotatably attached to the tape cassette body 11. installed. Lid spring 3
1 passes through the elongated hole 32 of the tape cassette body 11 and is stretched between a spring hook 33 implanted in the tape cassette body 11 and a spring hook hole 34 of the opening/closing lid 20, and the lid stay is not attached when not in use. 23 is the contact surface 3 of the tape cassette body 11
Pressed to 5. The opening/closing lid 20 is similarly pressed against the lid stay 23 and closed. Groove 36 in tape cassette body 11
a, the groove 36b of the lid stay 23, and the groove 36 of the opening/closing lid 12.
c is a positioning groove when the tape cassette is installed in the recording/reproducing apparatus. Next, FIGS.
This will be explained in conjunction with FIG.

When not in use, the opening/closing lid 20 is closed by the tension of the lid spring 31, as shown in FIG. 4, to protect the magnetic tape 17. FIG. 5 is a view taken along the Y arrow in FIG. 3, showing the tape cassette installed in the apparatus with the tape cassette body lid 12 facing upward. When the tape cassette is attached and pushed down to the proper position, the opening/closing lid 20 is pushed open upward by the lid opening claw 37 protruding from the device. At this time, the opening/closing lid 20 rotates in the direction of the arrow around the lid stay pin 26, and the lid stay 23 rotates around the tape cassette body 1.
6, which remains in contact with the contact surface 35 of 1, is
This is a view taken in the direction of arrow X in FIG. 3 in the same state as shown in the figure, and the opening/closing lid 20 rotates in the direction of the arrow as if integral with the lid stay 23 around the screw 28. That is, when one end of the opening/closing lid 20 rotates only the opening/closing lid 20, the other end is the opening/closing lid 2.
0 and the lid stay 23 rotate together.

Turn the tape cassette over and open the tape cassette body lid 12.
Even when installed as the bottom, the opening/closing lid 20 and lid stay 2
The opening/closing operation of the opening/closing lid 20 is exactly the same as the opening/closing operation described above, except that the positions of the opening/closing lid 20 are interchanged from side to side. Therefore, the opening/closing operation of the opening/closing lid 20 can be performed reliably. When the tape cassette is removed from the apparatus, the opening/closing lid 20 is automatically closed by the tension of the lid spring 31, resulting in the state shown in FIG. FIG. 7 shows another embodiment, in which the left and right support parts 21 of the opening/closing lid 20 are provided at the same position in the vertical direction.

Furthermore, the left and right lid stays 23 are symmetrical. In such a configuration, when the opening/closing lid 20 opens to one side, it rotates together with the lid stays 23 at both ends, and when opening to the other side, the opening/closing lid 2
Only 0 rotates. As explained above, the present invention rotatably supports one end of the lid stay on the tape cassette body,
Further, since the supporting portion of the opening/closing lid is rotatably supported at the other end of the lid stay, the opening/closing lid can be opened and closed both up and down with a simple configuration. Further, the tape cassette lid opening mechanism provided in the recording/reproducing apparatus only needs to have a claw-like protrusion, which has a simple structure and allows the lid to be opened reliably, thereby simplifying the apparatus. In addition, many of the effects described above by inverting the tape cassette and recording by dividing the magnetic tape into two in the width direction can be achieved by using a tape cassette with an opening/closing lid.

[Brief explanation of the drawing]

Figure 1A is a side view of a conventional tape cassette, Figure 2A is a diagram of a conventional magnetic tape recording pattern, Figure 2 is a diagram of a magnetic tape recording pattern of two-part recording, and Figure 3 is a diagram of a magnetic tape recording pattern of the present invention. An exploded perspective view of a tape cassette according to an example, FIG.
FIG. 5 is a partial side view of the same tape cassette showing the open/close lid closed state when viewed from the Y arrow in FIG. 3; FIG. x of
FIG. 7 is a partial side view showing the opening/closing lid in an open state in the direction of the arrows, and FIG. 7 is an exploded perspective view of the opening/closing lid showing a second embodiment of the present invention. 11... Tape cassette body, 12...
・Tape cassette body lid, 13...Reel, 1
4...Position regulating body, 17...Magnetic tape, 20...Opening/closing lid, 21...Support part, 22...Support wall , 23... Lid stay, 26... Lid stay pin, 28... Screw, 31... Lid spring, 36a, 36b, 36
c...Groove, 37...Claw for opening the lid.

Claims (1)

[Scope of Claims] 1. A tape cassette consisting of a reel for winding a magnetic tape, a tape cassette body housing the reel, and an opening/closing lid covering a recording/playback opening on the front surface of the tape cassette body. A lid stay is provided at both longitudinal ends of the opening/closing lid, a first fulcrum for rotatably supporting the opening/closing lid is provided at one end of the lid stay in the vertical direction, and the other end of the lid stay is rotatably mounted on the tape cassette body. A tape cassette characterized in that a second fulcrum is provided for movable support, and the opening/closing lid can be opened and closed in both up and down directions by means of the first and second fulcrums. 2. The device according to claim 1, characterized in that the first fulcrum provided on the lid stay at one end of the opening/closing lid is located at the upper end, and the first fulcrum provided on the lid stay at the other end is located at the lower end. tape cassette. 3. The tape cassette according to claim 1, wherein the first fulcrums provided on the lid stays at both ends of the opening/closing lid are disposed at the upper end or the lower end in the same direction.